CN108627742A - A kind of non-destructive method for assessing cable aging and running cable status - Google Patents
A kind of non-destructive method for assessing cable aging and running cable status Download PDFInfo
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- CN108627742A CN108627742A CN201810385582.8A CN201810385582A CN108627742A CN 108627742 A CN108627742 A CN 108627742A CN 201810385582 A CN201810385582 A CN 201810385582A CN 108627742 A CN108627742 A CN 108627742A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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Abstract
The invention discloses a kind of non-destructive methods for assessing cable aging and running cable status.The isothermal relaxation current characteristics of sample of cable process of depolarization is analyzed under XLPE cable sample and the different operation time limits after two kinds of polarization of this method pair, obtains the relevant parameters such as distribution of traps characteristic, and theories integration is provided for the state of insulation analysis of polymer.This method can provide the aging conditions of cable insulation, and its residual life is obtained with without reference to the history run of cabling.The present invention is a kind of nondestructive measurement, can be not only used for the quality of evaluation insulating performance of cable, can also obtain the characteristic of its internal space-charge and distribution of traps, can be used for the evaluation to insulating performance of cable.
Description
Technical field
The invention belongs to electric insulation fields, relate to a kind of for assessing cable aging and running the non-broken of cable status
Bad property method, the more particularly to evaluation method of the relevant parameters such as a kind of combination insulating inner distribution of traps characteristic.
Background technology
The aging of cable insulation is an important factor for influencing cable electrical performance, so to the aging shape of actual motion cable
State and insulation life assessment are always focus of attention in the industry.
In the prior art, resistance to platen press, medium consumption factor method are to be commonly used to evaluation crosslinked polyethylene (XLPE) electricity at present
The laboratory facilities of cable.Wherein, first, resistance to platen press is a kind of direct method for judging insulating performance of cable, can be relatively accurately
Cable life is assessed, but this method is difficult to accurately distinguish distributivity defect with centrality defect to cable life
It influences, and if the discharge time to cable core is inadequate after pressure resistance, residual charge can influence the measurement of insulation resistance.And
In experimentation, this method needs are constantly compared with the parameter of new cable, and processing data are relatively complicated.Secondly, medium damage
The measurement of dielectric loss angle δ is realized in consumption factor method Main Basiss frequency analysis, due to electric system power frequency component it is various because
Under the influence of element, fundamental frequency has certain fluctuation, not always ideal 50Hz, and is damaged to medium according to harmonic analysis method
It consumes the test of angle δ and analyzes also due to " spectral leakage " phenomenon generates larger error.These disadvantages all limit both
The popularization and application of method.
Invention content
Technical problem to be solved by the present invention lies in the purpose of the present invention is to provide one kind for assessing cable insulation
Aging and the non-destructive method for running cable status, insulation that can more accurately from microcosmic angle to actual motion cable
Performance is judged, and compared with traditional evaluation method, existing certain consistency, and with wider array of applicability and accurately
Property.
In order to solve the above-mentioned technical problem, the one side of the embodiment of the present invention provide it is a kind of for assess cable aging and
Run the non-destructive method of cable status comprising following steps：
Step 1 carries out aging pretreatment to all tested sample of cable, and is reliably electromagnetically shielded to cable ends；
Step 2 is polarised all survey sample of cable, and one end is reliably insulated, another termination high voltage direct current
Source, polarization time are set as 1800s, Polarization field strength 240V/mm；
All cables after polarization are carried out instantaneous short-circuit to remove the free charge on surface by step 3；
Step 4, measures and records isothermal relaxation electric current, and corresponding depolarization time is set as 1800s；
Step 5 is analyzed according to the isothermal relaxation electric current of each tested cable, determines cable degree of aging and isothermal
The incidence relation of relaxation electric current.
Wherein, the step 1 further comprises：
A plurality of water resistant tree XLPE cable and common XLPE cable are selected, it is old that unaged and different acceleration is respectively adopted
Change mode and ageing time obtain tested sample of cable after pretreatment；The common XLPE of simultaneous selection difference service life
Cable is as tested sample of cable；Wherein, accelerated ageing mode includes：Accelerated ageing and accelerate in air old in water
Change.
Wherein, in the step 5, following parameter is further selected to characterize operation cable status：Isothermal relaxation
Electric current, polarization contribution and aging factor.
Wherein, in the step 5, by data measured using isothermal relaxation electric current I as ordinate, time t is horizontal seat
Mark obtains the water resistant tree XLPE and common XLPE cable and the isothermal relaxation of different operation time limit cables of different degree of agings
Electric current changes with time relationship, wherein with cable degree of aging and the increase of the time limit is run, at the beginning of the relaxation electric current of sample
Initial value increases；And down slope time is elongated.
Wherein, in the step 5, relaxation current curve is fitted by using three rank decaying exponential functions, with
Isothermal relaxation electric current and the product I*t of time are ordinate, and the logarithm logt of time is abscissa, obtain matched curve I*t~
Logt obtains the degree of aging of sample and the distribution feelings of internal trap by the situation of movement of the peak value of curve and peak value
Condition.
Wherein, in the step 5, the polarization that different relaxations are calculated by data measured is contributed, and draws column
Figure is analyzed by the degree of aging of the variation tendency combination sample for the contribution that polarizes, obtains corresponding relation.
Wherein, in the step 5, (Q3) is contributed with interfacial polarization by polarization contribution (Q2) caused by calculating aging
Ratio be worth to aging factor A, wherein the numerical value of increase aging factor for running the time limit with cable increases therewith, i.e. cable
Degree of aging deepen.
Wherein, in the step 5, characterization cable aging and the different parameters for running cable status are compared, with
It the intensification of cable degree of aging and runs the increase of the time limit, relaxation electric current initial value increases, and die-away time increases, trap depth
It deepens, density of trapping charges becomes larger, and polarization contribution and aging factor also increase therewith.
Implement the embodiment of the present invention, has the advantages that：
In an embodiment of the present invention, by the water-resistant tree XLPE cable (K-type cable) and 10kV after polarization
The analysis of the relaxation current characteristics of XLPE cable (p-type cable) process of depolarization, the insulating inners such as extraction distribution of traps characteristic
Relevant information simultaneously carries out Mathematical treatment, is judged with the remaining life to cable.The isothermal of difference operation time limit sample of cable
Relaxation current characteristics is significantly different：With the increase of cable degree of aging and the operation time limit, the relaxation electric current initial value of sample
Increase, and down slope time is elongated；It is found through analysis, run the longer sample of cable of the time limit, density of trapping charges increases, and falls into
Trap energy level is deepened.This measurement and characterizing method of the present invention can be used in the evaluation of XLPE cable electrical insulation properties, and
Without destroying tested XLPE cable.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the one of a kind of non-destructive method for assessing cable aging and running cable status provided by the invention
The main flow schematic diagram of a embodiment；
Fig. 2 is the polarization and depolarization current principle curve graph involved in Fig. 1；
Fig. 3 is the lab diagram of the isothermal relaxation testing current involved in Fig. 1；
Fig. 4 (a) is the K-type cable isothermal relaxation current curve of different aging techniques and aging condition in Fig. 1；
Fig. 4 (b) is K-type cable I * t~logt matched curves of different aging techniques and aging condition in Fig. 1；
2 (Q of K-type cable slack process in Fig. 5 (a) Fig. 12) interfacial polarization contribution；
3 (Q of K-type cable slack process in Fig. 5 (b) Fig. 13) polarized contribution caused by aging；
Fig. 6 (a) is the p-type cable isothermal relaxation current curve of different aging techniques and aging condition in Fig. 1；
Fig. 6 (b) is p-type cable I * t~logt matched curves of different aging techniques and aging condition in Fig. 1；
Fig. 7 (a) is 2 (Q of p-type cable slack process in Fig. 12) interfacial polarization contribution；
Fig. 7 (b) is 3 (Q of p-type cable slack process in Fig. 13) polarized contribution caused by aging；
Fig. 8 (a) is different operation time limit cable isothermal relaxation current curves in Fig. 1；
Fig. 8 (b) is different operation time limit cable I * t~logt matched curves in Fig. 1.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clearly complete
Ground describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained without making creative work it is all its
Its embodiment, shall fall within the protection scope of the present invention.
Here, it should also be noted that, in order to avoid having obscured the present invention because of unnecessary details, in the accompanying drawings only
It shows the structure and/or processing step closely related with scheme according to the present invention, and is omitted little with relationship of the present invention
Other details.
A kind of non-demolition for assessing cable aging and running cable status provided by the invention is shown as shown in Figure 1
The main flow schematic diagram of property method.In the present embodiment, it the described method comprises the following steps：
Step S10 carries out aging pretreatment to all tested sample of cable, and carries out reliable electromagnetic screen to cable ends
It covers；Specifically, step S10 further comprises：
A plurality of water resistant tree XLPE cable and common XLPE cable are selected, it is old that unaged and different acceleration is respectively adopted
Change mode and ageing time obtain tested sample of cable after pretreatment；The common XLPE of simultaneous selection difference service life
Cable is as tested sample of cable；Wherein, accelerated ageing mode includes：Accelerated ageing and accelerate in air old in water
Change.
Step S11 is polarised all survey sample of cable, and one end is reliably insulated, another termination high voltage direct current
Source, polarization time are set as 1800s, Polarization field strength 240V/mm；
All cables after polarization are carried out instantaneous short-circuit to remove the free charge on surface by step S12；
Step S13, measures and records isothermal relaxation electric current, and corresponding depolarization time is set as 1800s；
Step S14 is analyzed according to the isothermal relaxation electric current of each tested cable, determines cable degree of aging and isothermal
The incidence relation of relaxation electric current.
Further, in the step S14, following parameter is further selected to characterize operation cable status：Deng
Temperature relaxation electric current, polarization contribution and aging factor.
In one example, in the step S14, by data measured using isothermal relaxation electric current I as ordinate, the time
T is abscissa, obtain the water resistant tree XLPE of different degree of agings and common XLPE cable and different operation time limit cables etc.
Temperature relaxation electric current changes with time relationship, wherein with cable degree of aging and runs the increase of the time limit, the relaxation of sample
Electric current initial value increases；And down slope time is elongated.
In one example, in the step S14, by using three rank decaying exponential functions to relaxation current curve into
Row fitting, using isothermal relaxation electric current and the product I*t of time as ordinate, the logarithm logt of time is abscissa, is fitted
Curve I*t~logt is fallen by the peak value of curve and the situation of movement of peak value come the degree of aging and inside for obtaining sample
The distribution situation of trap.
In one example, in the step S14, the polarization that different relaxations are calculated by data measured is contributed,
And block diagram is drawn, it is analyzed by the degree of aging of the variation tendency combination sample for the contribution that polarizes, obtains corresponding relation.
In one example, in the step S14, pass through polarization contribution (Q2) and interfacial polarization caused by calculating aging
The ratio of contribution (Q3) is worth to aging factor (A), wherein the numerical value for running the increase aging factor of the time limit with cable increases therewith
Greatly, i.e. the degree of aging of cable is deepened.
In one example, in the step S14, to characterization cable aging and run cable status different parameters into
Row compares, and with the intensification of cable degree of aging and the increase of the operation time limit, relaxation electric current initial value increases, and die-away time increases
Long, trap depth deepens, and density of trapping charges becomes larger, and polarization contribution and aging factor also increase therewith.
Principle to facilitate the understanding of the present invention.Above-mentioned steps will be illustrated by way of example below.It ties together
It closes shown in Fig. 2 to Fig. 8 (b).Wherein, Fig. 2 is the polarization involved in Fig. 1 and depolarization current principle curve graph；And Fig. 3 is Fig. 1
Involved in isothermal relaxation testing current lab diagram.
In an embodiment of the present invention, using 10kV water-resistant trees XLPE cable (K-type cable) and the common XLPE of 10kV
Cable (p-type cable) is as tested sample of cable.Specifically：
First, it please refers to shown in table 1,10kV water-resistant trees XLPE cable (K-type cable) in an example is provided in table 1
Classify with the common XLPE cables of 10kV (p-type cable) sample.
Table 1
Aging condition corresponding to different aging techniques is as follows：
1) accelerated ageing in water：Water filling in sample conductor, and cable efficiency test section is placed in water pipe, making alive
27.5kV adds electric current that conductor temperature is made to reach 95-100 DEG C, and each circulating-heating 8 hours is 16 hours cooling, it is possible to understand that
It is that, wherein above-mentioned each numerical value is only for example, can be adjusted accordingly in real process.
2) accelerated ageing in air：Cable is placed in air, and making alive 27.5kV adds electric current that conductor temperature is made to reach
95-100 DEG C, each circulating-heating 8 hours is 16 hours cooling.
Isothermal relaxation testing current carried out respectively to K-type cable, voltage swing added by polarization process is 1080V, when polarization
Between be 1800s；After polarization process, then short circuit 2 seconds carries out depolarization current test, the depolarization current testing time is
1800s.Shown in isothermal relaxation current test results such as Fig. 4 (a).
The intensification with degree of aging is can be seen that with reference to Fig. 4 (a), isothermal relaxation current curve shows certain change
Change trend.As degree of aging is deepened, relaxation current curve die-away time is elongated, and the decay current value of curve starting increases.
But it can be seen from the figure that K2 specimen relaxations curent change is unusual.K3 specimen relaxation curent changes are very big.
With reference to Fig. 4 (b), relaxation current curve is fitted using three rank decaying exponential functions, and draw I*t~logt
Curve graph.Wherein indicate the corresponding curve of K2, K1, K4, K3 respectively from top to bottom；It is bright there are one in I*t~logt curves
Aobvious peak value, this shows have a kind of polarization to occupy leading position.With the intensification of degree of aging, peak of curve is presented to the right
Mobile trend, this shows that the intensification with degree of aging, the trap depth of sample deepen.In addition, with the intensification of aging, examination
The density of trapping charges of sample increases.
As shown in table 2, K-type sample of cable fitting coefficient in an example is given in table 2.
Table 2
It can be seen that the intensification with degree of aging from table 2, increased trend is substantially presented in aging factor A, this table
Bright aging factor A can be evaluating the ageing state of cable.Wherein, a1, τ 1, a2, τ 2, a3, τ 3 are the parameters that fitting obtains,
They are related with the characteristic of dielectric substance, and ai has reacted the trap density of each polarization process；I is the pine of each polarization process
It relaxes the time, has reacted the trap depth of each polarization process.
With reference to shown in Fig. 5 (a) and 5 (b), the contribution of each polarization can be shown below：
Aging factor A can be worth to by the ratio of Q3 and Q2：
2 (Q of relaxation2) indicate interfacial polarization contribution, 3 (Q of relaxation3) indicate the tribute that polarizes caused by aging
It offers, calculates separately the polarization contribution of K-type cable.The pole of relaxation 2 and relaxation 3 it can be seen from Fig. 5 (a) and 5 (b)
Change contribution and increased trend is substantially presented with the intensification of degree of aging.This shows that degree of aging is deepened to make relaxation respectively
Process 2 and the degree of polarization of relaxation 3 increase.
Isothermal relaxation testing current is carried out respectively to p-type cable, process carries out the loose testing current of isothermal with to K-type cable
Process it is identical.
With reference to shown in Fig. 6 (a), in figure, the response curve of P4, P3 and P2 are corresponded to respectively from top to bottom；Wherein, isothermal relaxation
Current curve shows certain variation tendency.It is elongated with the intensification relaxation current curve die-away time of accelerated ageing degree,
The decay current value of curve starting increases.
With reference to shown in Fig. 6 (b), relaxation current curve is fitted using three rank decaying exponential functions, and draw I*t~
Logt curves, from up to the response curve for point corresponding to P4, P3 and P2 respectively in figure.It is bright there are one in I*t~logt curves
Aobvious peak value, this shows have a kind of polarization to occupy leading position.With the intensification of degree of aging, peak of curve is presented to the right
Mobile trend, this shows that the intensification with degree of aging, the trap depth of sample deepen.With the intensification of aging, sample
Density of trapping charges increases.
As shown in table 3, p-type sample of cable fitting coefficient in an example is given in table 3.
Table 3
As can be seen from Table 3, as increased trend is substantially presented in the intensification of degree of aging, aging factor A, this shows always
Changing factors A can be evaluating the ageing state of cable.
With reference to shown in Fig. 7 (a) and Fig. 7 (b), the polarization that p-type cable is calculated separately according to formula (1-1) and formula (1-2) is contributed.
The polarization of relaxation 2 and relaxation 3 is contributed substantially is presented increased trend with the intensification of degree of aging.This shows always
Change degree is deepened can be respectively so that relaxation 2 and the degree of polarization of relaxation 3 increase.
With reference to shown in Fig. 8 (a), the curve distribution and operation time limit relationship of XLPE cable relaxation electric current are larger.Run the time limit
More long, isothermal relaxation electric current initial value is bigger, and die-away time is longer.
With reference to shown in Fig. 8 (b), I*t~logt matched curves are drawn according to isothermal relaxation electric current theory.It follows that I*t
~logt curves and operation time limit relationship are larger.With the increase of the operation time limit, trap is in increase tendency, and trap level is deep
Increase tendency is also presented in degree.
As shown in table 4, the specifying information of the cable of three kinds of different operation time limits in an example is given in table 4.It is different
The sample of cable for running the time limit is the 10kV sample of cable of actual motion, the 10kV electricity of the different operation time limits used in this project
Cable sample cross is 400mm2。
Table 4
As shown in table 5, it gives corresponding to different operation time limit sample of cable relaxation current curve fitting coefficients in table 4.
Table 5
It can be obtained by the variation tendency of aging factor A in table, XLPE cable degree of aging is presented substantially according to the aging time limit
Increased trend.
In conclusion can be as carrying out Mathematical treatment to the isothermal relaxation electric current obtained by experiment come the remaining longevity to cable
Life is judged.
Implement the embodiment of the present invention, there is following advantageous effect：
In an embodiment of the present invention, by the water-resistant tree XLPE cable (K-type cable) and 10kV after polarization
The analysis of the relaxation current characteristics of XLPE cable (p-type cable) process of depolarization, the insulating inners such as extraction distribution of traps characteristic
Relevant information simultaneously carries out Mathematical treatment, is judged with the remaining life to cable.The isothermal of difference operation time limit sample of cable
Relaxation current characteristics is significantly different：With the increase of cable degree of aging and the operation time limit, the relaxation electric current initial value of sample
Increase, and down slope time is elongated；It is found through analysis, run the longer sample of cable of the time limit, density of trapping charges increases, and falls into
Trap energy level is deepened.This measurement and characterizing method of the present invention can be used in the evaluation of XLPE cable electrical insulation properties, and
Without destroying tested XLPE cable..
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above is only the specific implementation mode of the application, it is noted that for the ordinary skill people of the art
For member, under the premise of not departing from the application principle, several improvements and modifications can also be made, these improvements and modifications are also answered
It is considered as the protection domain of the application.
Claims (8)
1. a kind of non-destructive method for assessing cable aging and running cable status, it is characterised in that：Including following step
Suddenly：
Step 1 carries out aging pretreatment to all tested sample of cable, and is reliably electromagnetically shielded to cable ends；
Step 2 is polarised all survey sample of cable, and one end is reliably insulated, another termination high-voltage DC power supply, pole
The change time is set as 1800s, Polarization field strength 240V/mm；
All cables after polarization are carried out instantaneous short-circuit to remove the free charge on surface by step 3；
Step 4, measures and records isothermal relaxation electric current, and corresponding depolarization time is set as 1800s；
Step 5 is analyzed according to the isothermal relaxation electric current of each tested cable, determines cable degree of aging and isothermal relaxation
The incidence relation of electric current.
2. the method for claim 1, wherein the step 1 further comprises：
A plurality of water resistant tree XLPE cable and common XLPE cable are selected, unaged and different accelerated ageing side is respectively adopted
Formula and ageing time obtain tested sample of cable after pretreatment；The common XLPE cable of simultaneous selection difference service life
As tested sample of cable；Wherein, accelerated ageing mode includes：Accelerated ageing and in air accelerated ageing in water.
3. according to the method described in claim 2, it is characterized in that：In the step 5, following parameter pair is further selected
Operation cable status is characterized：Isothermal relaxation electric current, polarization contribution and aging factor.
4. according to the method described in claim 3, it is characterized in that, in the step 5, by data measured with isothermal pine
Relaxation electric current I be ordinate, time t be abscissa, obtain different degree of agings water resistant tree XLPE and common XLPE cable and
The isothermal relaxation electric currents of difference operation time limit cables change with time relationship, wherein with cable degree of aging and operation
The relaxation electric current initial value of the increase of the time limit, sample increases；And down slope time is elongated.
5. according to the method described in claim 3, it is characterized in that, in the step 5, by using three rank exponential dampings
Function pair relaxation current curve is fitted, using isothermal relaxation electric current and the product I*t of time as ordinate, the logarithm of time
Logt is abscissa, obtains matched curve I*t~logt, and sample is obtained by the situation of movement of the peak value of curve and peak value
Degree of aging and internal trap distribution situation.
6. according to the method described in claim 3, it is characterized in that, in the step 5, calculated by data measured different
The polarization of relaxation is contributed, and draws block diagram, is carried out by the degree of aging of the variation tendency combination sample for the contribution that polarizes
Analysis obtains corresponding relation.
7. the method according to claim 3 or 6, which is characterized in that in the step 5, caused by calculating aging
Polarization contribution (Q2) and the ratio of interfacial polarization contribution (Q3) obtain aging factor (A), wherein as cable runs the increasing of the time limit
The numerical value of aging factor is added to increase therewith, i.e., the degree of aging of cable is deepened.
8. the method according to claim 3 or 6, which is characterized in that in the step 5, to characterization cable aging and fortune
The different parameters of row cable status are compared, with the intensification of cable degree of aging and the increase of the operation time limit, relaxation electric current
Initial value increases, and die-away time increases, and trap depth deepens, and density of trapping charges becomes larger, polarization contribution and aging factor
Increase therewith.
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| CN109632695A (en) * | 2019-02-26 | 2019-04-16 | 广东电网有限责任公司 | A kind of crosslinking polyethylene-insulated cable insulation ageing state characterizing method and device |
| CN110231511A (en) * | 2019-07-05 | 2019-09-13 | 上海交通大学 | Isothermal relaxation current detection means based on separating and measuring loop method |
| CN110824316A (en) * | 2019-11-28 | 2020-02-21 | 四川大学 | XLPE cable trap parameter measuring method based on polarization-depolarization current test |
| CN110850196A (en) * | 2019-10-21 | 2020-02-28 | 国网吉林省电力有限公司长春供电公司 | Service life electric stress and/or thermal stress test platform for crosslinked polyethylene power cable |
| CN111025096A (en) * | 2019-11-19 | 2020-04-17 | 云南电网有限责任公司临沧供电局 | XLPE cable aging state evaluation method based on leakage current characteristic factor |
| CN111157854A (en) * | 2019-12-31 | 2020-05-15 | 国家电网有限公司 | Method and device for processing residual life of cable, storage medium and processor |
| CN112180191A (en) * | 2020-09-24 | 2021-01-05 | 安徽德尔电气集团有限公司 | Wire and cable aging state assessment method |
| CN112710820A (en) * | 2020-12-17 | 2021-04-27 | 国网上海市电力公司 | Rubber cable joint aging state evaluation method based on static contact angle |
| CN113064002A (en) * | 2021-03-16 | 2021-07-02 | 重庆大学 | Method for evaluating insulation aging state of 10kV XLPE cable |
| CN113376451A (en) * | 2021-06-10 | 2021-09-10 | 云南电网有限责任公司电力科学研究院 | Method and device for evaluating space charge and conductive current of cable insulating material |
| CN113777138A (en) * | 2021-09-07 | 2021-12-10 | 上海交通大学 | Insulation material aging state evaluation method based on linear boosting and isothermal relaxation current |
| CN116106657A (en) * | 2022-11-18 | 2023-05-12 | 西南交通大学 | Method for evaluating ageing state of EPDM (ethylene-propylene-diene monomer) cable based on electron trap effect |
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